110 F. H. Gravely. 
| _ 
with the other, and have not been able to find any constant difference 
between them. On the other hand, as soon as the mandibles were opened, 
a very marked difference became apparent between specimens from the 
Moluccas, western Dutch New Guinea and British New Guinea, and those 
from north (eastern) Dutch New Güinea, German New Guinea (with one 
exception), New Brittain, and the Salomon Islands. The speeimens before 
me include one colleeted by VON ROSENBERG in Amboina, as was also 
the type of ©. pumilio (KAUP), specimens of the same species determined 
by KUWERT as O. pumilio, and specimens of the other species determined 
by KUWERT as O. minimus, the latter being presumably co-types. So 
there can be no doubt as to the identity of the two species, which may be 
distinguished thus ;— 
1. Anterior lower tooth of both mandibles distinct and well developed. 
O. minimus, KUWERT, 1898, p. 313. 
-—— Anterior lower tooth of left mandible absent, that of right mandible 
fused at base with lowest terminal tooth. .O. pumilio (KAUP), 1871, p.50. 
Omegarius minimus, Kuwert. 
Redescribed from a fine series of specimens from New Brittain 
(N.-Bucht in Squally Island, Herbertshöhe in Matufi, and Gazelle Pen- 
insula) from German New Guinea (Stephansort in Kaiser-Wilhelms-Land) 
and from the north of (eastern) Dutch New Guinea (Pauwi and Samberi). 
There is also, in the collection of the Berlin Kg]. Zoologisches 
Museum, a single specimen from Timput in the Solomon Isles, which 
may perhaps belong to a distinct local race. But it so closely resembles 
some members of the Squally Island series (Hamburg Museum collection) 
that I cannot be sure of this withont seeing further specimens from the 
same locality. 
Length 18,5—25,5 mm. The anterior margin of the labrum is 
slightly concave; the sides are straight and parallel; the angles are rounded, 
and the left one is somewhat more prominent than the right. The 
mandibles are symmetrical; the upper toothı of each is small and blunt, 
sometimes obsolete; the remaining teeth are all distinet, simple and well 
developed. The lateral parts of the mentum are punctured throughout; 
the scars are of the form characteristic of the genus, and are a little 
variable in detail. The upper surface of the head is polished, and is 
usually punctured in the hollows in front of the parietal ridges, but may 
be entirely unpunctured. Both the outer tubercles are triangular in section, 
and truncate distally, being terminated by three small denticles of which 
the uppermost is longer and sharper than the two lower, while the inner 
one of the latter is sometimes obsolete; the left outer tubercle is slightly 
